# Runtimes

By default, Pykka builds on top of Python’s regular threading concurrency model, via the standard library modules `threading` and `queue`.

Alternatively, you may run Pykka on top of `gevent` or `eventlet`.

Note that Pykka does no attempt at supporting a mix of concurrency runtimes. Such a future feature has briefly been discussed in issue #11.

- Threading
  - Installation
  - API
- gevent
  - Installation
  - Code changes
  - API
- eventlet
  - Installation
  - Code changes
  - API